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- W72180875 abstract "The results are summarized: (1) Nuclei distrubution in fresh tap water changes rapidly with time within the first hour after water has been poured into the tank. It is difficult to reproduce the experimental results at relatively low powers within this period. (2) The most violent action (cavitation and streaming) was observed in tests with fresh tap water. The presence of a reflector enhanced the cavitation activity significantly. Stable bubble pattern with stationary bubbles were observed for most of the tests conducted with a long waiting time and without the presence of a reflector. (3) Sometimes four distinctive types of bubble behavior can be observed in one experiment. For example, at relatively high powers in tests with long waiting time and with the presence of a reflector, it was observed that there were stationary bubbles, rising bubbles, dancing bubbles, and streaming bubbles. (4) For tests conducted with long waiting time, no bubbles were observed even when input power was increased to a very high values (100 volts). However, bubbles can be made to appear suddenly by pertubing the frequency away from 1 MHz. Once the bubbles appear, they remain even when the frequency is returned to 1 MHz. This triggeringmore » phenomenon may be partly related to hysteresis. (5) The bubbles are gas (not vapor) since most of them gradually rise to the surface when the power is turned off. (6) At relatively high powers (/approximately 100 volts/, strong streaming and pulsing were observed. A group of bubbles was observed to move suddenly in the direction away form the transducer. This pulsing action does not occur at a fixed interval. 9 refs., 8 figs.« less" @default.
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- W72180875 date "1988-01-01" @default.
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- W72180875 title "Some observations of acoustic cavitation in water at 1 MHz" @default.
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